A method for manufacturing wide and thick slabs
A manufacturing method and slab technology, which is applied in the field of manufacturing wide and thick slabs, can solve problems such as cracks in the middle of the billet shell, and achieve the effects of avoiding middle cracks, extrusion deformation of casting billets, and stable walking
Active Publication Date: 2021-03-09
SHANDONG IRON & STEEL CO LTD
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Problems solved by technology
In addition, when the slab is walking in the sector, based on the existing hot slab pressure setting, the slab shell will produce intermediate crack defects under the action of the driving roller
Method used
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Embodiment 1
[0057] This embodiment 1 mainly adopts the manufacturing method of the present invention to make wide and thick slabs, and its main production process includes molten iron pretreatment, converter smelting, refining outside the furnace, slab continuous casting in sequence, and produces a tundish with 24 heats of molten steel in total. The cross-sectional size of the slab is 300mm*2200mm, and the casting speed is 0.8m / min. The roll gap settings are shown in the table below
[0058]
[0059] As shown in the above table, the roll gap shrinkage of the 1st stage to the 6th stage: 0.61mm; the 7th stage to the 8th stage roll gap shrinkage: 0.81mm; the 9th stage roll gap shrinkage: 0.1mm; the 10th stage roll gap shrinkage: 1.43mm ,11 roll gap shrinkage: 2.95mm, 12 roll gap shrinkage: 0.2mm; 13-14 roll gap shrinkage: 0.1mm. The hot blank pressure is selected as 60MPa, the pouring is stable, and the casting resistance is 1420KN.
[0060] A low-magnification sample was taken during t...
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Abstract
The invention relates to the technical field of continuous casting in metallurgical production, in particular to a method for manufacturing a wide and thick slab, the method comprising: 1) pre-processing molten iron, and spraying a composite desulfurizer into a molten iron tank with a spray gun to obtain low phosphorus , low-sulfur molten iron; 2) put the pretreated molten iron into the converter, carry out converter smelting through the top-bottom re-blowing technology, and obtain the molten steel after smelting; 3) carry out the out-furnace refining of the obtained molten steel, and increase the molten steel temperature through the electrode, Add alloying elements, adjust the composition of molten steel, and obtain refined molten steel; 4) The obtained refined molten steel is subjected to continuous slab casting, and a primary shell is formed through a mold, and the shell with a liquid core is cooled in the sector. It is completely solidified under the cooling action of the steel plate, and the stepped roll gap setting is used to ensure that the slab passes through the segment stick without deformation and bulging, and the slab is made into a wide and thick slab.
Description
technical field [0001] The invention belongs to the technical field of metallurgical production and continuous casting, and in particular relates to a method for manufacturing wide and thick slabs. Background technique [0002] Wide and thick plates are widely used in my country's economic construction, and are widely used in large ships, ocean-going platforms, hydropower units, thermal power units and long-distance pipelines. my country has recently built dozens of new wide and heavy plate rolling production lines, including Anshan Iron and Steel's 5000mm and 5500mm rolling mills, Baosteel's 5000mm rolling mills, etc., with a new capacity of more than 20 million tons. [0003] The internal quality of wide and thick slabs has a great influence on the properties of rolled products. Poor internal quality of cast slabs, if there are cracks in the middle, will lead to flaw detection failures of thick-sized rolled products. , S, P and other segregated elements form segregated in...
Claims
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IPC IPC(8): B22D11/16B22D11/12C21C1/02C21C5/35C21C7/00
CPCB22D11/1206B22D11/16C21C1/025C21C5/35C21C7/0006
Inventor 赵立峰公斌王忠刚卢波张海波张丽薛志
Owner SHANDONG IRON & STEEL CO LTD